<template>
  <div
    class="scroll-wrapper"
    :class="{'no-scroll': ifNoScroll}"
    @scroll.passive="handleScroll"
    ref="scrollWrapper"
  >
    <slot></slot>
  </div>
</template>

<script>
import {realPx} from '@/utils/utils'
export default {
  name: "scroll",
  props: {
    top: {
      type: Number,
      default: 0
    },
    bottom: {
      type: Number,
      default: 0
    },
    ifNoScroll: {
      type: Boolean,
      default: false
    },
    initPosition: {
      type: Object,
      default: () => {
        return {
          x: 0,
          y: 0
        };
      }
    }
  },
  methods: {
    handleScroll(e) {
      const offsetY =
        e.target.scrollTop || window.pageYOffset || document.body.scrollTop;
      this.$emit("onScroll", offsetY);
    },
    scrollTo(x, y) {
      this.$refs.scrollWrapper.scrollTo(x, y);
    },
    refresh() {
      if (this.$refs.scrollWrapper) {
        // this.$refs.scrollWrapper.style.height =
        //   window.innerHeight - realPx(this.top) - realPx(this.bottom) + "px";
        this.$refs.scrollWrapper.style.height = `calc(100% - ${realPx(
          this.bottom
        )}px - ${realPx(this.top)}px)`;
        this.$refs.scrollWrapper.addEventListener("scroll", this.handleScroll);
      }
    }
  },
  mounted() {
    this.refresh();
    this.$nextTick(() => {
      setTimeout(() => {
        this.scrollTo(this.initPosition.x, this.initPosition.y);
      }, 1);
    });
  }
};
</script>

<style lang="scss" scoped>
@import "../../assets/styles/global.scss";
.scroll-wrapper {
  position: relative;
  z-index: 100;
  width: 100%;
  overflow-x: hidden;
  overflow-y: scroll;
  -webkit-overflow-scrolling: touch;
  &::-webkit-scrollbar {
    display: none;
  }
  &.no-scroll {
    overflow: hidden;
  }
}
</style>
